No picture in Live TV

Hi folks, I'm new here and appreciate the forum & the help it offers.
I bought a new computer last week & it's pre-installed with W7. When I first put in my Mini TV DVB-T USB stick, W7 found drivers for it and WMC recognised it and gave me instant TV to watch. However, just this last 2 days it all went sour. I still have the channels listed but on each one I get sound and just a black screen. No idea what changed, perhaps a Windows update as you get heaps of these when running a new system. Anyway I have tried running the USB drivers again and re scanning my channels but the result is still the same. Any ideas folks? It's so annoying knowing it has worked but now it won"t. Here's my system stats.

Hi, Welcome.
Check which version of Nvidia driver you are running. If it's 285.62 then this is your problem.
Either rollback driver or download and install version 290.36 beta from here.
Beta and Legacy Drivers - GeForce

rustberger, you were spot on, I was running 285.62 and updating to 290.36 fixed everything. Can't thank you enough. Cheers mate.